Document Detail

Habituation of the orbicularis oculi reflex in dementia and dyskinetic states.
MedLine Citation:
PMID:  151127     Owner:  NLM     Status:  MEDLINE    
The habituation index is a quantitative expression of the ability of the orbicularis oculi (blink reflex) to adapt to a series of electrical stimuli applied to the supraorbital region. This parameter has been studied in a group of normal control subjects, and the results compared with those in cases of idiopathic and drug-induced Parkinsonism, states of dementia, and dyskinesias such as Huntington's chorea and senile chorea. Patients with Huntington's chorea showed a tendency for the reflex to habituate readily in contrast to patients with dementia caused by cortical atrophy and those with Parkinson's disease. Younger patients with Huntington's chorea had indices within the normal range. It seems unlikely that this test will prove of value in the detection of clinically unaffected relatives. Where dementia was associated with a reversible intracranial lesion, the habituation index was studied before and after treatment. Failure of habituation in this condition appears to be due to the release of a primitive protective reflex.
I T Ferguson; J A Lenman; B B Johnston
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of neurology, neurosurgery, and psychiatry     Volume:  41     ISSN:  0022-3050     ISO Abbreviation:  J. Neurol. Neurosurg. Psychiatr.     Publication Date:  1978 Sep 
Date Detail:
Created Date:  1978-11-29     Completed Date:  1978-11-29     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  2985191R     Medline TA:  J Neurol Neurosurg Psychiatry     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  824-8     Citation Subset:  IM    
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MeSH Terms
Delirium, Dementia, Amnestic, Cognitive Disorders / physiopathology,  psychology*
Dyskinesia, Drug-Induced / psychology
Electric Stimulation
Eyelids / innervation*
Habituation, Psychophysiologic / physiology*
Huntington Disease / psychology
Middle Aged
Movement Disorders / physiopathology,  psychology*
Parkinson Disease / psychology
Reflex / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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